Flex :  The art and science of leadership in a changing world / 
Jeffrey Hull, PhD.  
 - vii, 263 pages :  illustrations ;  19cm. 
<br/><br/><label>ISBN: </label>9780143133094 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Leadership.<br/>Management.<br/>Motivation (Psychology)